Characteristics of primates

6 major extinction events:

Ordovician
Devonian
Permian- killed off most of life; worst one
Triassic
Cretaceous- meteorite killed off 75% of life
Now - can see the things going extinct now, and can look at the fossil record to know what went extinct in the past

relatedness

reciprocal altruism

is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar manner at a later time.

apical dominance

signals do plants respond to and how they respond

photomorphogenisis - how lights affects the final form of a plant
phototropism - growth in repsonse to light (plants cells will grow towards the light source, oxin is released on dark side of stem which makes these cells get bigger)
gravitrophism - growth in response to gravity (both positive and negative gravitropism because of stems and roots)